LXR linux/sound/drivers/opl4/opl4

   1/*
   2 * OPL4 sequencer functions
   3 *
   4 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
   5 * All rights reserved.
   6 *
   7 * Redistribution and use in source and binary forms, with or without
   8 * modification, are permitted provided that the following conditions
   9 * are met:
  10 * 1. Redistributions of source code must retain the above copyright
  11 *    notice, this list of conditions, and the following disclaimer,
  12 *    without modification.
  13 * 2. The name of the author may not be used to endorse or promote products
  14 *    derived from this software without specific prior written permission.
  15 *
  16 * Alternatively, this software may be distributed and/or modified under the
  17 * terms of the GNU General Public License as published by the Free Software
  18 * Foundation; either version 2 of the License, or (at your option) any later
  19 * version.
  20 *
  21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31 * SUCH DAMAGE.
  32 */
  33
  34#include "opl4_local.h"
  35#include <linux/init.h>
  36#include <linux/moduleparam.h>
  37#include <linux/module.h>
  38#include <sound/initval.h>
  39
  40MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  41MODULE_DESCRIPTION("OPL4 wavetable synth driver");
  42MODULE_LICENSE("Dual BSD/GPL");
  43
  44int volume_boost = 8;
  45
  46module_param(volume_boost, int, 0644);
  47MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
  48
  49static int snd_opl4_seq_use_inc(struct snd_opl4 *opl4)
  50{
  51        if (!try_module_get(opl4->card->module))
  52                return -EFAULT;
  53        return 0;
  54}
  55
  56static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4)
  57{
  58        module_put(opl4->card->module);
  59}
  60
  61static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info)
  62{
  63        struct snd_opl4 *opl4 = private_data;
  64        int err;
  65
  66        mutex_lock(&opl4->access_mutex);
  67
  68        if (opl4->used) {
  69                mutex_unlock(&opl4->access_mutex);
  70                return -EBUSY;
  71        }
  72        opl4->used++;
  73
  74        if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
  75                err = snd_opl4_seq_use_inc(opl4);
  76                if (err < 0) {
  77                        mutex_unlock(&opl4->access_mutex);
  78                        return err;
  79                }
  80        }
  81
  82        mutex_unlock(&opl4->access_mutex);
  83
  84        snd_opl4_synth_reset(opl4);
  85        return 0;
  86}
  87
  88static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info)
  89{
  90        struct snd_opl4 *opl4 = private_data;
  91
  92        snd_opl4_synth_shutdown(opl4);
  93
  94        mutex_lock(&opl4->access_mutex);
  95        opl4->used--;
  96        mutex_unlock(&opl4->access_mutex);
  97
  98        if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
  99                snd_opl4_seq_use_dec(opl4);
 100        return 0;
 101}
 102
 103static struct snd_midi_op opl4_ops = {
 104        .note_on =              snd_opl4_note_on,
 105        .note_off =             snd_opl4_note_off,
 106        .note_terminate =       snd_opl4_terminate_note,
 107        .control =              snd_opl4_control,
 108        .sysex =                snd_opl4_sysex,
 109};
 110
 111static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct,
 112                                    void *private_data, int atomic, int hop)
 113{
 114        struct snd_opl4 *opl4 = private_data;
 115
 116        snd_midi_process_event(&opl4_ops, ev, opl4->chset);
 117        return 0;
 118}
 119
 120static void snd_opl4_seq_free_port(void *private_data)
 121{
 122        struct snd_opl4 *opl4 = private_data;
 123
 124        snd_midi_channel_free_set(opl4->chset);
 125}
 126
 127static int snd_opl4_seq_probe(struct device *_dev)
 128{
 129        struct snd_seq_device *dev = to_seq_dev(_dev);
 130        struct snd_opl4 *opl4;
 131        int client;
 132        struct snd_seq_port_callback pcallbacks;
 133
 134        opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 135        if (!opl4)
 136                return -EINVAL;
 137
 138        if (snd_yrw801_detect(opl4) < 0)
 139                return -ENODEV;
 140
 141        opl4->chset = snd_midi_channel_alloc_set(16);
 142        if (!opl4->chset)
 143                return -ENOMEM;
 144        opl4->chset->private_data = opl4;
 145
 146        /* allocate new client */
 147        client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num,
 148                                              "OPL4 Wavetable");
 149        if (client < 0) {
 150                snd_midi_channel_free_set(opl4->chset);
 151                return client;
 152        }
 153        opl4->seq_client = client;
 154        opl4->chset->client = client;
 155
 156        /* create new port */
 157        memset(&pcallbacks, 0, sizeof(pcallbacks));
 158        pcallbacks.owner = THIS_MODULE;
 159        pcallbacks.use = snd_opl4_seq_use;
 160        pcallbacks.unuse = snd_opl4_seq_unuse;
 161        pcallbacks.event_input = snd_opl4_seq_event_input;
 162        pcallbacks.private_free = snd_opl4_seq_free_port;
 163        pcallbacks.private_data = opl4;
 164
 165        opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks,
 166                                                      SNDRV_SEQ_PORT_CAP_WRITE |
 167                                                      SNDRV_SEQ_PORT_CAP_SUBS_WRITE,
 168                                                      SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
 169                                                      SNDRV_SEQ_PORT_TYPE_MIDI_GM |
 170                                                      SNDRV_SEQ_PORT_TYPE_HARDWARE |
 171                                                      SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
 172                                                      16, 24,
 173                                                      "OPL4 Wavetable Port");
 174        if (opl4->chset->port < 0) {
 175                int err = opl4->chset->port;
 176                snd_midi_channel_free_set(opl4->chset);
 177                snd_seq_delete_kernel_client(client);
 178                opl4->seq_client = -1;
 179                return err;
 180        }
 181        return 0;
 182}
 183
 184static int snd_opl4_seq_remove(struct device *_dev)
 185{
 186        struct snd_seq_device *dev = to_seq_dev(_dev);
 187        struct snd_opl4 *opl4;
 188
 189        opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev);
 190        if (!opl4)
 191                return -EINVAL;
 192
 193        if (opl4->seq_client >= 0) {
 194                snd_seq_delete_kernel_client(opl4->seq_client);
 195                opl4->seq_client = -1;
 196        }
 197        return 0;
 198}
 199
 200static struct snd_seq_driver opl4_seq_driver = {
 201        .driver = {
 202                .name = KBUILD_MODNAME,
 203                .probe = snd_opl4_seq_probe,
 204                .remove = snd_opl4_seq_remove,
 205        },
 206        .id = SNDRV_SEQ_DEV_ID_OPL4,
 207        .argsize = sizeof(struct snd_opl4 *),
 208};
 209
 210module_snd_seq_driver(opl4_seq_driver);
 211